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KVM: PPC: Book3S HV: Save and restore CR in __kvmppc_vcore_entry

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The ABI specifies that CR fields CR2--CR4 are nonvolatile across function
calls.  Currently __kvmppc_vcore_entry doesn't save and restore the CR,
leading to CR2--CR4 getting corrupted with guest values, possibly leading
to incorrect behaviour in its caller.  This adds instructions to save
and restore CR at the points where we save and restore the nonvolatile
GPRs.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras 2012-02-03 00:53:21 +00:00
parent b4e51229d8
commit a5ddea0e78
1 changed files with 6 additions and 2 deletions
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8
arch/powerpc/kvm/book3s_hv_interrupts.S
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@ -46,8 +46,10 @@ _GLOBAL(__kvmppc_vcore_entry)
/* Save host state to the stack */
stdu r1, -SWITCH_FRAME_SIZE(r1)
/* Save non-volatile registers (r14 - r31) */
/* Save non-volatile registers (r14 - r31) and CR */
SAVE_NVGPRS(r1)
mfcr r3
std r3, _CCR(r1)
/* Save host DSCR */
BEGIN_FTR_SECTION
@ -157,8 +159,10 @@ kvmppc_handler_highmem:
* R13 = PACA
*/
/* Restore non-volatile host registers (r14 - r31) */
/* Restore non-volatile host registers (r14 - r31) and CR */
REST_NVGPRS(r1)
ld r4, _CCR(r1)
mtcr r4
addi r1, r1, SWITCH_FRAME_SIZE
ld r0, PPC_LR_STKOFF(r1)